<?php

final class db_access {
private $config = null;
public $link = null;
public $lastqueryid = null;
public $querycount = 0;
public function __construct() {
}
public function open($config) {
$this->config = $config;
if($config['autoconnect'] == 1) {
$this->connect();
}
}
public function connect() {
$dbhost = $this->config['hostname'];
$dbuser = $this->config['username'];
$dbpwd  = $this->config['password'];
$this->conn = new com('adodb.connection');
if(!$this->conn) return false;
$this->conn->open("DRIVER={Microsoft Access Driver (*.mdb)};dbq=$dbhost;uid=$dbuser;pwd=$dbpw");
if($this->conn->state == 0){
$this->conn->open("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=$dbhost");
if($this->conn->state == 0)	return false;;
}
define('NUM',1);
define('ASSOC',2);
define('BOTH',3);
return $this->conn->state;
}
function select_db($dbname)
{
return $this->conn->state;
}
function query($sql,$type = '',$expires = 3600,$dbname = '')
{
$this->querynum++;
$sql = trim($sql);
if(preg_match("/^(select.*)limit ([0-9]+)(,([0-9]+))?$/i",$sql,$matchs))
{
$sql = $matchs[1];
$offset = $matchs[2];
$pagesize = $matchs[4];
$query = $this->conn->Execute($sql);
return $this->limit($query,$offset,$pagesize);
}
else
{
return $this->conn->Execute($sql);
}
}
function get_one($query)
{
$this->querynum++;
$rs = $this->conn->Execute($query);
$r = $this->fetch_array($rs);
$this->free_result($rs);
return $r;
}
function fetch_array($rs,$result_type = 3)
{
if(is_array($rs))
{
return $this->cursor <count($rs) ?$rs[$this->cursor++] : FALSE;
}
else
{
if($rs->EOF) return FALSE;
$array = array();
for($i = 0;$i <$this->num_fields($rs);$i++)
{
$fielddata = $rs->Fields[$i]->Value;
if($result_type == NUM ||$result_type == BOTH) $array[$i] = $fielddata;
if($result_type == ASSOC ||$result_type == BOTH) $array[$rs->Fields[$i]->Name] = $fielddata;
}
$rs->MoveNext();
return $array;
}
}
function select($sql,$keyfield = '')
{
$array = array();
$result = $this->query($sql);
while($r = $this->fetch_array($result))
{
if($keyfield)
{
$key = $r[$keyfield];
$array[$key] = $r;
}
else
{
$array[] = $r;
}
}
$this->free_result($result);
return $array;
}
function num_rows($rs)
{
return is_array($rs) ?count($rs) : $rs->recordcount;
}
function num_fields($rs)
{
return $rs->Fields->Count;
}
function fetch_assoc($rs)
{
return $this->fetch_array($rs,ASSOC);
}
function fetch_row($rs)
{
return $this->fetch_array($rs,NUM);
}
function free_result($rs)
{
if(is_resource($rs)) $rs->close();
}
function error()
{
return $this->conn->Errors[$this->conn->Errors->Count-1]->Number;
}
function errormsg()
{
return $this->conn->Errors[$this->conn->Errors->Count-1]->Description;
}
function close()
{
$this->conn->close();
}
function limit($rs,$offset,$pagesize = 0)
{
if($pagesize >0)
{
$rs->Move($offset);
}
else
{
$pagesize = $offset;
}
$info = array();
for($i = 0;$i <$pagesize;$i++)
{
$r = $this->fetch_array($rs);
if(!$r) break;
$info[] = $r;
}
$this->free_result($rs);
$this->cursor = 0;
return $info;
}
}
?>